array ( 0 => 'index.php', 1 => 'PHP Manual', ), 'head' => array ( 0 => 'UTF-8', 1 => 'pt_BR', ), 'this' => array ( 0 => 'function.mcrypt-encrypt.php', 1 => 'mcrypt_encrypt', ), 'up' => array ( 0 => 'ref.mcrypt.php', 1 => 'Mcrypt Funções', ), 'prev' => array ( 0 => 'function.mcrypt-enc-self-test.php', 1 => 'mcrypt_enc_self_test', ), 'next' => array ( 0 => 'function.mcrypt-generic-deinit.php', 1 => 'mcrypt_generic_deinit', ), 'alternatives' => array ( ), 'source' => array ( 'lang' => 'en', 'path' => 'reference/mcrypt/functions/mcrypt-encrypt.xml', ), ); $setup["toc"] = $TOC; $setup["toc_deprecated"] = $TOC_DEPRECATED; $setup["parents"] = $PARENTS; manual_setup($setup); ?>
(PHP 4 >= 4.0.2, PHP 5, PHP 7 < 7.2.0, PECL mcrypt >= 1.0.0)
mcrypt_encrypt — Encrypts plaintext with given parameters
Esta função tornou-se DEFASADA a partir do PHP 7.1.0 e foi REMOVIDA a partir do PHP 7.2.0. O uso desta função é fortemente desencorajado.
$cipher
,$key
,$data
,$mode
,$iv
= ?Encrypts the data and returns it.
cipher
Uma das constantes MCRYPT_nome_da_cifra
ou o nome do algoritmo como string.
key
The key with which the data will be encrypted. If the provided key size is
not supported by the cipher, the function will emit a warning and return false
data
The data that will be encrypted with the given cipher
and mode
. If the size of the data is not n * blocksize,
the data will be padded with '\0
'.
The returned crypttext can be larger than the size of the data that was
given by data
.
mode
Uma das constantes MCRYPT_MODE_nome_do_modo
ou uma das seguintes strings: "ecb", "cbc", "cfb", "ofb", "nofb" ou "stream".
iv
Usado para a inicialização nos modos CBC, CFB, OFB e em alguns algoritmos no modo STREAM. Se o tamanho do IV fornecido não for suportado pelo modo de encadeamento ou nenhum IV for fornecido, mas o modo de encadeamento exigir um, a função emitirá um aviso e retornará false
.
Returns the encrypted data as a string ou false
em caso de falha.
Exemplo #1 mcrypt_encrypt() Example
<?php
# --- ENCRYPTION ---
# the key should be random binary, use scrypt, bcrypt or PBKDF2 to
# convert a string into a key
# key is specified using hexadecimal
$key = pack('H*', "bcb04b7e103a0cd8b54763051cef08bc55abe029fdebae5e1d417e2ffb2a00a3");
# show key size use either 16, 24 or 32 byte keys for AES-128, 192
# and 256 respectively
$key_size = strlen($key);
echo "Key size: " . $key_size . "\n";
$plaintext = "This string was AES-256 / CBC / ZeroBytePadding encrypted.";
# create a random IV to use with CBC encoding
$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
# creates a cipher text compatible with AES (Rijndael block size = 128)
# to keep the text confidential
# only suitable for encoded input that never ends with value 00h
# (because of default zero padding)
$ciphertext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key,
$plaintext, MCRYPT_MODE_CBC, $iv);
# prepend the IV for it to be available for decryption
$ciphertext = $iv . $ciphertext;
# encode the resulting cipher text so it can be represented by a string
$ciphertext_base64 = base64_encode($ciphertext);
echo $ciphertext_base64 . "\n";
# === WARNING ===
# Resulting cipher text has no integrity or authenticity added
# and is not protected against padding oracle attacks.
# --- DECRYPTION ---
$ciphertext_dec = base64_decode($ciphertext_base64);
# retrieves the IV, iv_size should be created using mcrypt_get_iv_size()
$iv_dec = substr($ciphertext_dec, 0, $iv_size);
# retrieves the cipher text (everything except the $iv_size in the front)
$ciphertext_dec = substr($ciphertext_dec, $iv_size);
# may remove 00h valued characters from end of plain text
$plaintext_dec = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key,
$ciphertext_dec, MCRYPT_MODE_CBC, $iv_dec);
echo $plaintext_dec . "\n";
?>
O exemplo acima produzirá:
Key size: 32 ENJW8mS2KaJoNB5E5CoSAAu0xARgsR1bdzFWpEn+poYw45q+73az5kYi4j+0haevext1dGrcW8Qi59txfCBV8BBj3bzRP3dFCp3CPQSJ8eU= This string was AES-256 / CBC / ZeroBytePadding encrypted.